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  • 1
    Electronic Resource
    Electronic Resource
    The influence of nutritional and genetic factors on larval performance of the cinnabar moth, Tyria jacobaeae (1992)
    Springer
    Entomologia experimentalis et applicata 62 (1992), S. 29-36 
    Details
    ISSN: 1570-7458
    Keywords: Alkaloids ; cinnabar moth ; insect genetics ; larval performance ; Lepidoptera ; nutritional ecology ; nitrogen ; sugar ; Tyria jacobaeae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In a laboratory experiment using full-sibs, 60% of the variation in pupal weight of the monophage Tyria jacobaeae L. (Lepidoptera, Arctiidae) could be explained by variation in the nitrogen concentration of the food plant, Senecio jacobaea L. and only 4% by variation in sugar concentration. Larval weight and growth rates of young and old larvae were also positively correlated with nitrogen and sugar concentration. Developmental time was negatively correlated with nitrogen concentration. In a second experiment full-sib families differed significantly in larval weight at day 7, mortality, growth rate and developmental time. Pupal weight did not differ significantly among families, but was positively correlated with nitrogen concentration of Senecio. Larval performance was not significantly influenced by concentrations of sugars or alkaloids. We conclude that larval performance of Tyria during most of the larval period is mainly determined by genetic factors, but pupal weights are primarily determined by nitrogen concentration of the food plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00185638
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of alkaloids by differential pulse polarography. III Corydalis alkaloids (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 737-740 
    Details
    ISSN: 1040-0397
    Keywords: Alkaloids ; pulse polarography ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Corydalis alkaloids have been investigated by differential pulse polarography as part of our continuing study of alkaloids. In this study, the alkaloidal content of Corydalis solida (L.) subsp. solida was determined. The results were compared by their structure and reduction mechanism. Quantitative analysis illustrates that Corydalis alkaloids can be determined down to sub-ppm level using differential pulse polarography in Britton-Robinson buffer pH 10. The amount of the various alkaloids in Corydalis solida (L.) subsp. solida have been shown. It was concluded that the reduction process at the dropping mercury electrode was catalytic in nature.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140040712
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  • 3
    Electronic Resource
    Electronic Resource
    Solanum Alkaloids, 124. Preparation of N-Hydroxyspirosolane Alkaloids (1992)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 1091-1093 
    Details
    ISSN: 0170-2041
    Keywords: Solasodines ; Tomatidines ; Alkaloids ; Solanum steroid alkaloids ; Spirosolanes ; Steroids ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The N-Hydroxyspirosolane alkaloids N-hydroxysolasodine (1) and N-hydroxytomatidine (10) as well as the N-hydroxy-22,26-epiminocholestene 7 have been prepared by oxidation of the respective amines 2, 11, and 5 with hydrogen peroxide in the presence of selenium dioxide.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1992199201179
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  • 4
    Electronic Resource
    Electronic Resource
    Eine kurze, effektive Synthese von rac-Deplanchein (1992)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 1321-1323 
    Details
    ISSN: 0170-2041
    Keywords: Alkaloids ; Deplancheine ; Indoles ; β-Carbolines ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Short and Effective Synthesis of rac-DeplancheineTryptamine and dimethyl methoxyallylidenemalonate (1) react to give the divinylogous urethane 2, which yields by reaction with acroleine under acid catalysis the β-carboline 3a. Reductive decarboxylation gives the target compound deplancheine (4a) in excellent overall yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1992199201217
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  • 5
    Electronic Resource
    Electronic Resource
    Polycyclic Aromatic Alkaloids, 8. The Structure of Neocalliactine Acetate  -  Proof by Total Synthesis (1992)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 1205-1207 
    Details
    ISSN: 0170-2041
    Keywords: Calliactine ; Neocalliactine acetate ; Alkaloids ; Calliactis parasitica ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The pentacyclic compound 1 is prepared in six steps by starting from 5,8-quinolinedione (7). Its spectral data are in accordance with those of neocalliactine acetate, a derivative or the marine alkaloid calliactine. This represents the first definite confirmation of the structure of neocalliactine acetate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1992199201199
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  • 6
    Electronic Resource
    Electronic Resource
    β-Carbolin-Alkaloide, I. Synthese von 1-Aryl- und 1-Alkenyl-β-carbolinen durch Palladium-katalysierte Kupplungsreaktionen (1992)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 1315-1319 
    Details
    ISSN: 0170-2041
    Keywords: β-Carbolines ; Komaroine ; Perlolyrine ; Pavettine ; Alkaloids ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: β-Carboline Alkaloids, I.  -  Syntheses of 1-Aryl- and 1-Alkenyl-β-carbolines by Palladium-Catalyzed Coupling Reactions1-Chloro-β-carboline (6) is prepared in three steps starting from tryptamine (3). Palladium-catalyzed coupling reactions of 6 with aryl boronic acids offer an easy access to the alkaloids komaroine (11) and perlolyrine (15). Pavettine (16) is prepared by coupling of 6 with tributylvinylstannane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1992199201216
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  • 7
    Electronic Resource
    Electronic Resource
    The Enchanting Alkaloids of YuzurihaThis review article grew out of a series of lectures presented in Germany in July 1990, as the Merck-Schuchardt Lectureship. The full details of our work on the total synthesis of Daphniphyllum alkaloids are reported in a series of articles recently published in the Journal of Organic Chemistry: see ref. [1]. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 31 (1992), S. 665-681 
    Details
    ISSN: 0570-0833
    Keywords: Alkaloids ; Synthetic methods ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The oriental plant Yuzuriha (Daphniphyllum macropodum) elaborates a fascinating family of polycyclic, squalene-derived alkaloids that provide a test for state-of-the-art methods of organic synthesis. The intriguing structures of these natural products have inspired us to design and explore two rather different approaches for their laboratory synthesis. This article recounts and contrasts these two different syntheses. The first approach was based on a method of synthetic design that emphasizes efficient construction of the polycyclic skeleton of the molecule (Corey's “network analysis”). A strategic bond was identified and the synthesis planned around the late formation of this bond. The synthesis that was designed by this approach proceeded smoothly until the point where it was necessary to remove functional groups that had been incorporated solely for the purpose of forming the strategic bond. Although the problems were eventually overcome, the resulting synthesis was too long and did not control the configuration of one of the stereocenters. The second approach was based on a possible biosynthesis of one of the alkaloids and provided surprisingly easy access to the simpler members of the family. The success of this synthesis led to a concrete proposal about the biosynthesis of the alkaloids and to the discovery of the astonishing transformation depicted in Scheme 27. In this marvelous reaction, an acyclic squalene derivative is converted by successive treatment with ordinary commodity chemicals into a pentacyclic alkaloid. The transformation involves the formation of four carbon-carbon bonds, two carbon-nitrogen bonds, and one carbon-hydrogen bond!
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.199206653
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